4-[4-(7H-Pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]piperidin-4-ylacetonitrile (361 mg, 1.17 mmol) and N-cyano-S,S′-dimethyldithioimido carbonate (344 mg, 2.35 mmol) were dissolved in isopropyl alcohol (2.5 mL) and DMSO (2.5 mL) at 20° C. After 16 h reaction time, LCMS analysis showed the presence of some product, M+H 406; of the reagent, M+H 147; and of the piperidine, M+H 308. HPLC analysis showed about 2% reaction. The HPLC method was: Zorbax SB C18, 5 μm, 15 cm, 35° C., flow 1.2 mL/min, 5% ACN—H2O (0.05% TFA), 1.5 min, to 100% ACN in 15.0 min; detector set at 324, 225, and 265 nm. The retention time of the starting material was 4.9 min (UV max 224, 262, 292, & 325 nm); of the product, 6.5 min (UV max 226, 262, 290, & 324 nm); and of the reagent, 7.7 min (UV max 265 nm). To the product was added TEA (327 μL, 2.35 mmol), and the resulting mixture was stirred at RT. After stirring for 3 h, HPLC and LCMS analyses showed 60% reaction. The product and the unreacted piperidine were isolated by prep HPLC using a 30 mm×100 mm C18 column; 5% ACN—H2O (0.1% TFA), 1.0 min, to 35% at 6 min; 60 mL/min; detector set at 326 nm. The retention time for the product was 5.9 min; and for the starting piperidine was 3.5-4.3 min. The product was freeze dried to yield 301 mg of a white solid TFA salt. 1H NMR (d6-DMSO) δ 12.85 (s, 1H); 9.01 (s, 1H); 8.90 (s, 1H); 8.59 (s, 1H); 7.85 (m, 1H); 7.30 (m, 1H); 4.23 (m, 2H); 3.35 (m, 2H); 3.30 (s, 2H); 2.78 (m, 2H); 2.68 (s, 3H); 2.16 (m, 2H). MS (ES) 406 (M+H).
